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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A260406 Numbers n such that (n-1)^2-1 divides 2^(n-1)-1.

Table of values

n a(n)
1 1
2 3
3 5
4 17
5 37
6 257
7 457
8 1297
9 2557
10 4357
11 6481
12 8009
13 11953
14 26321
15 44101
16 47521
17 47881
18 49681
19 57241
20 65537
21 74449
22 84421
23 97813
24 141157
25 157081
26 165601
27 225457
28 278497
29 310591
30 333433
31 365941
32 403901
33 419711
34 476737
35 557041
36 560737
37 576721
38 647089
39 1011961

List of values

[1, 3, 5, 17, 37, 257, 457, 1297, 2557, 4357, 6481, 8009, 11953, 26321, 44101, 47521, 47881, 49681, 57241, 65537, 74449, 84421, 97813, 141157, 157081, 165601, 225457, 278497, 310591, 333433, 365941, 403901, 419711, 476737, 557041, 560737, 576721, 647089, 1011961]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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